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Home Rewiring · Colorado
Rewiring replaces old branch-circuit wiring, such as knob-and-tube, ungrounded cloth-insulated cable or 1960s–70s aluminum branch wiring, with modern grounded copper cable. It can be done room by room, and an electrician will tell you which circuits matter most.
Hail and lightning on the Front Range, heavy snow in the mountains and a fast-growing EV fleet shape most electrical calls.
Across the Mountain West, homes deal with dry air, large temperature swings, wildfire seasons and heavy snow at elevation. Permit offices, utilities and housing stock differ by city, which affects how home rewiring is planned and scheduled. These local guides cover the Colorado cities where we have written specific notes.
Denver's Victorian homes and early-1900s brick bungalows in neighborhoods such as Washington Park, Highland, Capitol Hill and Congress Park often still have knob-and-tube or cloth-insulated wiring, sometimes alongside circuits added during basement finishes. Solid brick walls make rewiring slower than in frame houses, so electricians route new cable through basements, attics and interior walls.
Utility: Xcel Energy
The Old North End and the older streets near Colorado College hold many of Colorado Springs' Victorian and early-1900s homes, and some still have knob-and-tube or cloth wiring with circuits added over the decades. Rewiring usually comes up during restoration, before insulating attics, or when an insurer asks.
Utility: Colorado Springs Utilities (city-owned)
Original Aurora's oldest homes near Colfax date from the early 1900s, and the 1950s and 1960s ranch houses of Hoffman Heights and Del Mar now have wiring 60 or more years old, sometimes with ungrounded outlets and too few circuits. Rewiring usually comes up during renovation, a basement finish or when an insurer asks.
Utility: Xcel Energy
Old Town Fort Collins and the streets around Colorado State University hold many homes from the late 1800s to the 1930s, and some still have knob-and-tube or cloth wiring, often in houses that have been student rentals for decades. Rewiring usually comes up during renovation, before insulating, or when an insurer asks.
Utility: Fort Collins Utilities
Pueblo's North Side holds Victorian homes built for the city's steel executives and merchants, and the Bessemer neighborhood near the mill was filled with smaller homes for steelworkers, many of them built with only a few circuits. Knob-and-tube and cloth wiring still turn up in both.
Utility: Black Hills Energy
1. Assessment
Wiring type, condition and circuit layout are documented.
2. Plan and permit
Circuits are prioritized and the work is permitted.
3. Rewire
New cable is fished through walls and ceilings with minimal openings.
4. Inspection and patching
Rough-in and final inspections, then wall openings are closed.
Electricians set their own prices; local permit fees and utility requirements add to these factors.
Permits come from the city or county where the home is. For example: Denver: Electrical permits in Denver are issued by Community Planning and Development; surrounding cities have their own building departments. Colorado Springs: Electrical permits in Colorado Springs and El Paso County come from the Pikes Peak Regional Building Department, which serves the city and much of the region. Aurora: Electrical permits inside city limits come from the City of Aurora's building division; parts of Aurora lie in Adams and Douglas counties. Fort Collins: Electrical permits inside city limits come from the City of Fort Collins' building services; unincorporated Larimer County has its own. Pueblo: Electrical permits come from the Pueblo Regional Building Department, which serves the city and county.
Denver: Xcel Energy. Colorado Springs: Colorado Springs Utilities (city-owned). Aurora: Xcel Energy. Fort Collins: Fort Collins Utilities. Pueblo: Black Hills Energy.
No. Many homeowners rewire in phases, starting with kitchens, baths and bedrooms.
Aluminum branch wiring can overheat at connections. Approved repairs (such as rated connectors) or replacement reduce the risk; an electrician can advise which fits.
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